Describe the bug
Spells, features, etc with just the name Null translate into a property :null which breaks the JS

To Reproduce

Steps to reproduce the behavior:
Create a spell named Null
Add it to a spell list
Select the class with that spell

Expected behavior

For keywords to not be literally translated from text and break things.

Additional context

We need to just add some flags/sanitization to append something to the name/feature so that doesn't happen.
eg. null > null-spell or null > null-feature